I liked The Legend of Zelda's Hyrule the best. It contained hundreds of secrets and the only thing missing was villages. I assume that Ganon destroyed them all, or there were no villages anywhere close to Death Mountain.
In a Zelda game, overall, I would pick Termina as a best Zelda game layout. I know it's an off topic thing to bring up, but I really loved the developed characters and their developed environment. It's something missing from Hyrule, and I hope it is in SS.